Development and Standardization of the Diagnostic Adaptive Behavior Scale: Application of Item Response Theory to the Assessment of Adaptive Behavior

2016 ◽  
Vol 121 (2) ◽  
pp. 79-94 ◽  
Author(s):  
Marc J. Tassé ◽  
Robert L. Schalock ◽  
David Thissen ◽  
Giulia Balboni ◽  
Henry (Hank) Bersani ◽  
...  
Keyword(s):  
Intellectual Disability ◽  
Item Response Theory ◽  
Item Response ◽  
Adaptive Behavior ◽  
Practical Skills ◽  
Item Pool ◽  
Response Theory ◽  
Initial Item ◽  
Behavior Scale ◽  
Nationally Representative

Abstract The Diagnostic Adaptive Behavior Scale (DABS) was developed using item response theory (IRT) methods and was constructed to provide the most precise and valid adaptive behavior information at or near the cutoff point of making a decision regarding a diagnosis of intellectual disability. The DABS initial item pool consisted of 260 items. Using IRT modeling and a nationally representative standardization sample, the item set was reduced to 75 items that provide the most precise adaptive behavior information at the cutoff area determining the presence or not of significant adaptive behavior deficits across conceptual, social, and practical skills. The standardization of the DABS is described and discussed.

scholarly journals An item response theory analysis of an item pool for the recovering quality of life (ReQoL) measure

2020 ◽  
Author(s):  
Anju Devianee Keetharuth ◽  
Jakob Bue Bjorner ◽  
Michael Barkham ◽  
John Browne ◽  
Tim Croudace ◽  
...  
Keyword(s):  
Mental Health ◽  
Item Response Theory ◽  
Item Response ◽  
Measurement Precision ◽  
Model Parameters ◽  
Item Pool ◽  
Response Theory ◽  
Differential Item Function ◽  
Wide Range ◽  
Internal Construct Validity

Abstract Purpose ReQoL-10 and ReQoL-20 have been developed for use as outcome measures with individuals aged 16 and over, experiencing mental health difficulties. This paper reports modelling results from the item response theory (IRT) analyses that were used for item reduction. Methods From several stages of preparatory work including focus groups and a previous psychometric survey, a pool of items was developed. After confirming that the ReQoL item pool was sufficiently unidimensional for scoring, IRT model parameters were estimated using Samejima’s Graded Response Model (GRM). All 39 mental health items were evaluated with respect to item fit and differential item function regarding age, gender, ethnicity, and diagnosis. Scales were evaluated regarding overall measurement precision and known-groups validity (by care setting type and self-rating of overall mental health). Results The study recruited 4266 participants with a wide range of mental health diagnoses from multiple settings. The IRT parameters demonstrated excellent coverage of the latent construct with the centres of item information functions ranging from − 0.98 to 0.21 and with discrimination slope parameters from 1.4 to 3.6. We identified only two poorly fitting items and no evidence of differential item functioning of concern. Scales showed excellent measurement precision and known-groups validity. Conclusion The results from the IRT analyses confirm the robust structure properties and internal construct validity of the ReQoL instruments. The strong psychometric evidence generated guided item selection for the final versions of the ReQoL measures.

Using Item Response Theory to Develop a 60-Item Representation of the NEO PI–R Using the International Personality Item Pool: Development of the IPIP–NEO–60

2017 ◽  
Vol 101 (1) ◽  
pp. 4-15 ◽  
Author(s):  
Jessica L. Maples-Keller ◽  
Rachel L. Williamson ◽  
Chelsea E. Sleep ◽  
Nathan T. Carter ◽  
W. Keith Campbell ◽  
...  
Keyword(s):  
Item Response Theory ◽  
Item Response ◽  
Item Pool ◽  
Response Theory ◽  
Personality Item ◽  
Item Representation

scholarly journals Using Item Response Theory (IRT) to Improve the Efficiency of the Simple Clinical Colitis Activity Index (SCCAI) for Patients with Ulcerative Colitis

2020 ◽  
Author(s):  
Alissa Walsh ◽  
Rena Cao ◽  
Darren Wong ◽  
Ramona Kantschuster ◽  
Lawrence Matini ◽  
...  
Keyword(s):  
Ulcerative Colitis ◽  
Item Response Theory ◽  
Disease Activity ◽  
Item Response ◽  
Activity Index ◽  
Response Theory ◽  
Faecal Calprotectin ◽  
Metric Properties ◽  
Initial Item ◽  
Item Scale

Abstract BackgroundThe SCCAI was designed to facilitate assessment of disease activity in ulcerative colitis (UC). We aimed to interrogate the metric properties of individual items of the SCCAI using item response theory (IRT) analysis, to simplify and improve its performance. MethodsThe original 9-item SCCAI was collected through TrueColours, a real-time software platform which allows remote entry and monitoring of patients with UC. Data were securely uploaded onto Dementias Platform UK Data Portal, where they were analysed in Stata 16.1 SE. A 2-parameter (2-PL) logistic IRT model was estimated to evaluate each item of the SCCAI for its informativeness (discrimination). A revised scale was generated and re-assessed following systematic removal of items. ResultsSCCAI data for 516 patients (41 years, SD=15) were examined. After initial item deletion (Erythema nodosum, Pyoderma gangrenosum), a 7-item scale was estimated. Discrimination values (information) ranged from 0.41 to 2.52 suggesting selected item inefficiency. Systematic item deletions found that a 4-item scale (bowel frequency day; bowel frequency nocturnal; urgency; rectal bleeding) was more informative and discriminatory of trait severity (discrimination values of 1.50 to 2.78). The 4-item scale possesses higher scalability and unidimensionality, suggesting that the responses to items are either direct endorsement or non-endorsement of the trait (disease activity). Conclusion Reduction of the SCCAI from the original 9-item scale to a 4-item scale provides optimum trait information that will minimise response burden. This new 4-item scale needs validation against other measures of disease activity such as faecal calprotectin, endoscopy and histopathology.

scholarly journals Using Item Response Theory (IRT) to Improve the Efficiency of the Simple Clinical Colitis Activity Index (SCCAI) for patients with ulcerative colitis

2020 ◽  
Author(s):  
Alissa Walsh ◽  
Rena Cao ◽  
Darren Wong ◽  
Ramona Kantschuster ◽  
Lawrence Matini ◽  
...  
Keyword(s):  
Ulcerative Colitis ◽  
Item Response Theory ◽  
Disease Activity ◽  
Item Response ◽  
Activity Index ◽  
Response Theory ◽  
Faecal Calprotectin ◽  
Metric Properties ◽  
Initial Item ◽  
Item Scale

Abstract BackgroundThe SCCAI was designed to facilitate assessment of disease activity in ulcerative colitis (UC). We aimed to interrogate the metric properties of individual items of the SCCAI using item response theory (IRT) analysis, to simplify and improve its performance. MethodsThe original 9-item SCCAI was collected through TrueColours, a real-time software platform which allows remote entry and monitoring of patients with UC. Data were securely uploaded onto Dementias Platform UK Data Portal, where they were analysed in Stata 16.1 SE. A 2-parameter (2-PL) logistic IRT model was estimated to evaluate each item of the SCCAI for its informativeness (discrimination). A revised scale was generated and re-assessed following systematic removal of items. ResultsSCCAI data for 516 UC patients (41 years, SD=15) treated in Oxford were examined. After initial item deletion (Erythema nodosum, Pyoderma gangrenosum), a 7-item scale was estimated. Discrimination values (information) ranged from 0.41 to 2.52 indicating selected item inefficiency with three items <1.70 which is a suggested discriminatory value for optimal efficiency. Systematic item deletions found that a 4-item scale (bowel frequency day; bowel frequency nocturnal; urgency to defaecation; rectal bleeding) was more informative and discriminatory of trait severity (discrimination values of 1.50 to 2.78). The 4-item scale possesses higher scalability and unidimensionality, suggesting that the responses to items are either direct endorsement (patient selection by symptom) or non-endorsement of the trait (disease activity). Conclusion Reduction of the SCCAI from the original 9-item scale to a 4-item scale provides optimum trait information that will minimise response burden. This new 4-item scale needs validation against other measures of disease activity such as faecal calprotectin, endoscopy and histopathology.

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